<template>
    {{ obj.message }}
</template>

<script setup>
    import { reactive } from 'vue'
    const obj = reactive ({ message:'不畏浮云遮望眼，自缘身在最高层'})
    setTimeout(() => {
        obj.message = '欲穷千里目，更上一层楼'
    }, 2000)
</script>